title: 6,8-Di-bromo-3-nitro-2-phenyl-2H-chromene.
abstract: In the title compound, C15H9Br2NO3, the chromene unit is not quite planar (r.m.s. deviation from planarity = 0.0888 Å). The di-hydro-pyran ring adopts an envelope conformation with the phenyl-substituted C atom fused to the di-hydro-pyran ring as the flap. The dihedral angle between the plane defined by this C atom and the adjacent C and O atoms and the mean plane of the di-hydro-pyran ring excluding the phenyl-substituted C atom is 25.1 (3)°. The dihedral angle between the mean plane of the chromene unit and the phenyl ring is 85.7 (1)°. The crystal structure features C-H⋯O hydrogen bonds and Br⋯O contacts [3.289 (3) Å] involving the nitro O atoms.
authors.affiliation: Department of Medicinal Chemistry, School of Pharmacy, Fourth Military Medical University, Changle Xilu 169, 710032 Xi-An, People's Republic of China.
authors.forename: Lin-Jie
authors.initials: LJ
authors.lastname: Yan
authors.forename: Sheng-Yong
authors.initials: SY
authors.lastname: Zhang